STEP Core requirements

Im trying to install S.T.E.P via the guides, and maybe Im just being a moron but I dont understand it at all.

There is a S.T.E.P: core compilation, which from the descriptions I believe to be a compilation of the core STEP mods. However, this compilation has mod requirements itself, but I cant find a list of these requirements, or where the compilation pack fits into the guide.

Any help would be appreciated, even a link to where I can find the information.